Tricyclic 1,2,4-triazolo-quinazolines

A compound of the formula ##STR25## wherein Q and R.sub.a are different and either a nitrogen atom or a =CR'"-function,

• R.degree. represents ##STR26## R' represents hydrogen, and R" represents hydrogen;
• lower alkyl of 1 to 5 carbon atoms;
• allyl;
• methylallyl;
• propargyl;
• cycloalkyl of 3 to 6 carbon atoms;
• or di(lower of 1 to 3 carbon atoms)alkylamino(lower of 1 to 4 carbon atoms)alkyl;
• or lower alkoxy of 1 to 4 carbon atoms (lower of 1 to 4 carbon atoms)alkyl;
• or
• R' and R" together with the nitrogen attached to the ring represent di(lower of 1 to 3 carbon atoms)alkylamino;
• diallylamino;
• di(methylallyl)amino;
• or dipropargylamino;
• or
• R' and R" together with the nitrogen attached to the tricyclic ring system form a 3 to 6 membered saturated heterocyclic group represented by:
• ##STR27## wherein X is (a) direct bond or (b) methylene, and y and z are 0 or 1, provided that X is a direct bond when either y or z is 0;
• R'" represents hydrogen or lower alkyl of 1 to 4 carbon atoms;
• R.sub.1 represents fluoro, chloro, bromo, lower alkyl of 1 to 3 carbon atoms, lower alkoxy of 1 to 3 carbon atoms, nitro, trifluoromethyl or, when n 2, the two R.sub.1 's together form methylenedioxy, and
• n is 0, 1, 2 or 3, and when 2, then R.sub.1 may be the same or different, and when 3, then all R.sub.1 's are alkoxy;
• provided that n is 1 when R.sub.1 is nitro or trifluoromethyl.